光束

Methods The operating astral lamp employs specially-designed LED as the point light source to focalize lights into a beam for operating illumination,and IC is used as the control circuit to manipulate the brightness, focusing, running detecting, alarming, partially auto-repairing and exchanging between AC and DC.

用特定的发光二极管作手术无影灯的点光源，聚焦形成手术照明光束，用单片机IC作控制电路控制无影灯的亮度、聚焦、运行状态检测、报警和部分自动修复等。

If a particular color or wavelength of light hits the ytterbium when it is in the excited state this light will be a aplined, generating a carbon copy of the original light. In this way a very lower perfect beam can be amplified many times to produce high power beam that are nearly perfect and are therefore very focusable.

如果一种特殊的颜色或光线的波长击中 Yb ，而此时正是激发状态时，这种特殊颜色的光线将被放大产生高能量的近乎完美而且有聚焦能力的光束。

The results show that the stability of Gaussian beam in such a system depends strongly on the crystal temperature.

结果表明，晶体的温度与高斯光束的稳定性密切相关。

We present a flat-top laser beam generation scheme using coherent beam combining of hexagonally arranged Gaussian lasers.

本文提出一种新的平顶光束产生方案，它由六角排列的若干个高斯光源经相干合束而成。

The paper studies the principle of homochromous beam grating scanning.

着重分析了单色光束的光栅扫描理论。

The mathematical simulation is based on interferential theory, and the effect of the vertex of the axicon.is also considered.

数值模拟过程中，基于相干光干涉理论，考虑到实际情况中锥尖不尖带来的影响，建立了三光束干涉的数学模型。

In fact, there is the pattern with dark central region and the high visibility diffraction fringes around, and the radius of dark region largen with thc reduced radius of the incident beam.

理论上分析了反射图样暗场的半径与边界入射光束半径的解析关系，实验室上计算了弯曲液面的斜率，进而得出弯曲液面上升的最大高度和接触角。

When a collimated laser beam illumines the curved liquid surface by the wetting rod, the special reflective patterns, which correspond to the boundary light reflection, can be produced. In fact, there is the pattern with dark central region and the high visibility diffraction fringes around, and the radius of dark region largen with the reduced radius of the incident beam.

当平行激光束垂直入射到由细棒润湿效应引起的弯曲液面上时，边界反射产生特殊的反射图样，图样的中心为圆形暗场，周围有清晰的衍射条纹，并且暗场的半径随入射光束半径的缩小而变大。

The beams from the lensed photonic crystal fibers have similar behaviors as Gaussian beams, but the data gotten from the measurement and the theory are still discrepant.

光子晶体光纤射出的光在自由空间的传播特性上与高斯光束有类似的行为，但量测的数据与理论预测的数值仍有差异。

The mostly used techniques to improve the coupling efficiency and alignment tolerance include using micro single lens, micro lens group and lensed fiber.

通常采用单个透镜，透镜组或者光纤微透镜的方式来改善半导体激光器的出射光束质量，提高耦合效率和容忍度。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。